Which of the following shows dimerisation?

Which of the following processes is used to prepare borazine?

Aqueous solution of which of the following boron compounds will be strongly basic in nature?

Statement $I$: Boron does not exhibit allotropy.
Statement $II$: Boron is an extremely hard and black-coloured solid.

Is boric acid a protic acid? Explain.

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$ : Boric acid is a weak acid.
Reason $R$ : Boric acid is not able to release $H^{+}$ ion on its own. It receives $OH^{-}$ ion from water and releases $H^{+}$ ion.
In the light of the above statements,choose the most appropriate answer from the options given below.